/*
 * Copyright 2002-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.web.socket.server.support;

import javax.servlet.ServletContext;

import org.springframework.context.Lifecycle;
import org.springframework.context.SmartLifecycle;
import org.springframework.web.context.ServletContextAware;
import org.springframework.web.servlet.handler.SimpleUrlHandlerMapping;

/**
 * An extension of {@link SimpleUrlHandlerMapping} that is also a
 * {@link SmartLifecycle} container and propagates start and stop calls to any
 * handlers that implement {@link Lifecycle}. The handlers are typically expected
 * to be {@code WebSocketHttpRequestHandler} or {@code SockJsHttpRequestHandler}.
 *
 * @author Rossen Stoyanchev
 * @since 4.2
 */
public class WebSocketHandlerMapping extends SimpleUrlHandlerMapping implements SmartLifecycle {

    private volatile boolean running = false;


    @Override
    protected void initServletContext(ServletContext servletContext) {
        for (Object handler : getUrlMap().values()) {
            if (handler instanceof ServletContextAware) {
                ((ServletContextAware) handler).setServletContext(servletContext);
            }
        }
    }

    @Override
    public boolean isAutoStartup() {
        return true;
    }

    @Override
    public int getPhase() {
        return Integer.MAX_VALUE;
    }

    @Override
    public void start() {
        if (!isRunning()) {
            this.running = true;
            for (Object handler : getUrlMap().values()) {
                if (handler instanceof Lifecycle) {
                    ((Lifecycle) handler).start();
                }
            }
        }
    }

    @Override
    public void stop() {
        if (isRunning()) {
            this.running = false;
            for (Object handler : getUrlMap().values()) {
                if (handler instanceof Lifecycle) {
                    ((Lifecycle) handler).stop();
                }
            }
        }
    }

    @Override
    public void stop(Runnable callback) {
        stop();
        callback.run();
    }

    @Override
    public boolean isRunning() {
        return this.running;
    }

}
